Proces of making pipe-bends.



J. H. TAYLOR.

PROCESS OF MAKING PIPE BBNDS;

APPLICATION FILED 00'1.3, 1910.

Patented Apr. 16, 1912 Inven or 2 James Hall Ta Lur- I Wi. masses minished in thickness by the process,

the process JAMES HALL TAYLOR, OF OAK PARK, ILLINOIS.

PROCESS OF MAKING PIPE-BENDS.

Specification of Letters Patent.

Patented Apr. 16, 1912.

Application filed October 3, 1910. Serial No. 585,008.

To all whom it may concern:

Be it known that I, J AMES HALL TAYLOR,

My invention is a process and, as will more fully appear hereinafter, is most useful in making slight or gradual turns or bends in wrought metal pipe of comparatively large diameter.

Broadly, the process of my invention comprises two steps; first, stretching a portion of the pipe wall out of the line of the contour of the pipe, and, second, straightening the portion thus stretched back into the substantial contour of the pipe, a slight bend in the pipe resulting. Of course, the StIGtChBdlPOItlOII of the pipe wall is dibut the decrease is so small as to be negligible.

The above outlined process can be carried out in various ways, but, more specifically, which I contemplate as the most useful consists in first expanding a portion of the pipe wall into an eccentric and consequently tapered bead, the metal within the defined area being therefore stretched so as to diminish in cross-sectional area. In

' straightening this expanded portion or bead,

as will be apparent, a slight bend in the pipe results, this process being repeated as often as necessary until the desired turn or bend is secured.

My invention will be more readily understood by reference to the accompanying drawings, in which Figure 1 is an elevational View of a straight section of pipe; Fig. 2 is an end view thereof; Fig. 3 is an elevational view of the section of pipe, showing the result of the first step in the process; Fig. 4: is an end View of the pipe as shown in Fig. 3; Fig. 5 illustrates the result of the next step 'tration, that it is desired to in the process; Figs. 6 and 7 illustrate the manner of repeating the process; and Fig. 8 is an elevational view showing the finished product.

Let it be assumed, for the purposes of illusproduce a bend of about five degrees in the pipe section a, shown in Figs. 1 and 2. By means of suitable blocking on the outside of the pipe section and suitable blocking and expanding mechanism on the inside of the pipe section, the eccentric bead b is expanded into the form shown in Figs. 3 and 4. The part of the pipe wall which is expanded is clearly and definitely defined by means of the blocking and an inspection of the drawings will show that the portion of the pipe which is stretched in this way tapers in both directions toward that point in the pipe which will be on the inside of the resulting angle or bend. The axis of the pipe is maintained during this process of expanding the bead and it follows that the cross-sectional area of the expanded portion of the wall of the pipe will be smallest at the point where the wall is expanded the most and will widen in both directions toward the coincident ends at the point before referred to as that which will be on the inside of the bend. This much of the process being completed, the expanded portion is then brought back into the substantial contour of the pipe, as

shown in Fig. 5. The dot-and-dash lines 0, c bound the stretched portion of the pipe, and, since the angle between these lines will be greater than the angle between the side lines of the tapered bead, the axis of the portion a of the pipe will no longer be co incident with the main axis. The cross-sectional thickness of the pipe between the lines 0, c of course becomes less than it was originally, but the decrease by the process is so slight as to be negligible. If the resultant bend, which has been described, is not sufficient, a second bead Z2 may be expanded directly adjacent the expanded and stretched portion 6 which formerly formed the bead, as shown in Fig. 6, or further along in the- P p bead back into the substantial contour of the pipe, a further and accumulating bendis secured.

The center lines of the beads are pref-- if desired. In straightening the-next erably at right angles, or substantially so, to the main center line of the pipe, and it is clear that they could be repeated indefinitely.

Fig. 7 shows how the process can be repeated until the desired bend, as shown in Fig. 8, is secured.

If a sharper turn is desired, the succeeding beads can be made to overlap, thus stretching a portion of the pipe Wall already stretched.

It is clear that the stretched portion of the pipe Wall could extend inwardly of the pipe as Well as outwardly therefrom and that a number of stretched portions could be made and then simultaneously straightened.

In making an ordinary single bend the vertices of the tapered beads lie in a line substantially parallel to the main axis of the pipe, but it Will be evident that compound bends,that is a system of bends in different directions, can be secured by shifting these vertices either one Way or the other.

I claim as new and desire to secure by Letters Patent:

1. The process of making bends in Wrought metal pipe, which consists in expanding a portion of said pipe into a transverse bead tapered at both ends, and then straightening the metal thus stretched back into the substantial contour of the pipe.

2. The process of making bends in Wrought metal pipe, which consists in expanding a portion of the pipe bound by lines converging at both ends at a common point, and then straightening the metal thus stretched back into the substantial contour of the pipe.

In Witness whereof, I hereunto subscribe my name this 30th day of September, A. D. 1910.

JAMES HALL TAYLOR.

Witnesses:

ARTHUR H. BOETTOHER, ROBERT F. BRACKE.

Copies of this patent may be obtained for five cents each, by addressing the Washington, D. C.

Commissioner of Patents, 

